# -*- coding: utf-8 -*-
# @Time    : 20 2月 2025 1:11 下午
# @Author  : codervibe
# @File    : Proxy.py
# @Project : pythonBasics
import sys
import socket
import threading

HEX_FILTER = "".join(
    [(len(repr(chr(i))) == 3) and chr(i) or "." for i in range(256)])


def hexdump(src, length=16, show=True):
    if isinstance(src, bytes):
        src = src.decode()

    result = list()
    for i in range(0, len(src), length):
        word = str(src[i:i + length])

        printable = word.translate(HEX_FILTER)
        hexa = " ".join([f"{ord(c):02X}" for c in word])
        hexwidth = length * 3
        result.append(f"{i:04x} {hexa:<{hexwidth}} {printable}")

    if show:
        for line in result:
            print(line)
    else:
        return result


def receive_from(connection):
    buffer = b""
    connection.settimeout(5)
    try:
        while True:
            data = connection.recv(4096)
            if not data:
                break
            buffer += data
    except Exception as e:
        pass
    return buffer


def request_handler(buffer):
    # perform packet modifications
    return buffer


def response_handler(buffer):
    # perform packet modifications
    return buffer


def proxy_handler(client_socket, remote_host, remote_port, receive_first):
    remote_socket = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
    remote_socket.connect((remote_host, remote_port))

    if receive_first:
        remote_buffer = receive_from(remote_socket)
        hexdump(remote_buffer)

        remote_buffer = response_handler(remote_buffer)

        if len(remote_buffer):
            print("[<==] Sending %d bytes to localhost." % len(remote_buffer))
            client_socket.send(remote_buffer)
    while True:
        local_buffer = receive_from(client_socket)
        if len(local_buffer):
            line = "[==>] Received %d bytes from localhost." % len(local_buffer)
            print(line)
            hexdump(local_buffer)

            local_buffer = request_handler(local_buffer)
            remote_socket.send(local_buffer)
            print("[==>] Sent to remote.")

        remote_buffer = receive_from(remote_socket)
        if len(remote_buffer):
            print("[<==] Received %dbytes from remote." % len(remote_buffer))
            hexdump(remote_buffer)

        if not len(local_buffer) or not len(remote_buffer):
            client_socket.close()
            remote_socket.close()
            print("[*] No more data. Closing connections.")
            break


def server_loop(local_host, local_port, remote_host, remote_port, receive_first):
    server = socket.socket(socket.AF_INET, socket.SOCK_STREAM)

    try:
        server.bind((local_host, local_port))
    except Exception as e:
        print("Problem on bind: %r" % e)

        print("[!!] Failed to listen on %s:%d" % (local_host, local_port))
        print("[!!] Check for other listening sockets or correct permissions.")
        sys.exit(0)

    print("[*] Listening on %s:%d" % ())
    server.listen(5)
    while True:
        client_socket, addr = server.accept()
        print("[==>] Received connection from %s:%d" % (addr[0], addr[1]))
        proxy_thread = threading.Thread(
            target=proxy_handler,
            args=(client_socket, remote_host, remote_port, receive_first)
        )
        proxy_thread.start()


if __name__ == '__main__':
    if len(sys.argv[1:]) != 5:
        print("Usage: ./proxy.py [localhost] [localport] ", "end=")
        print("[remotehost] [remoteport] [receive_first]")
        print("Example: ./proxy.py 127.0.0.1 9000 10.12.132.1 9000 True")
        sys.exit(0)
        local_host = sys.argv[1]
        local_port = int(sys.argv[2])

        remote_host = sys.argv[3]
        remote_port = int(sys.argv[4])

        receive_first = sys.argv[5]

        if "True" in receive_first:
            receive_first = True
        else:
            receive_first = False

        server_loop(local_host, local_port, remote_host, remote_port, receive_first)



